A tractor-trailer truck jack-knifed on Interstate 95's Saugatuck River bridge Tuesday evening, tying up rush-hour traffic and leaking fuel into the river and parking lot below.

Although the truck was heavily damaged in the crash just after 6 p.m., the driver did not suffer serious injuries, according to Westport firefighters. He was taken to Norwalk Hospital for treatment.

The truck driver told firefighters he was cut off by another vehicle, and swerved to avoid hitting others when he lost control and hit the bridge wall. The crash caused oil and diesel fuel to leak from the truck into storm drains, as well as the Saugatuck River and parking lot below the bridge.

Firefighters used speedi dri and absorbent booms and pads to prevent further runoff of the fluids. The state Department of Environmental Protection and the Coast Guard were notified of the spill. Two agents from the DEP came to oversee the cleanup, which was done by crews hired from Connecticut Tank Removal.

State Department of Transportation trucks applied sand to the highway to make the surface less slippery.

The tractor-trailer truck had to be towed from the scene, which was cleared about 8:45 p.m.